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Chlorine, Bromine and Iodine form a Dobe...

Chlorine, Bromine and Iodine form a Dobereiner’s triad. The atomic masses of Chlorine and iodine are 35.5 and 126.9 respectively. Predict the atomic mass of Bromine.

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Atomic mass of Br `= (35.5 + 126.9)/(2) = (162.4)/(2)=81.2`
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